Rheem PowerVent Commercial Gas Water Heater User manual

Brand: Rheem

Model: PowerVent Commercial Gas Water Heater

Category: Water heaters & boilers

Type: User manual

This manual is also suitable for

Professional Classic Series: Ultra Low NOx Power Vent

AP15212-1 (08/10)

FOR YOUR SAFETY!

— Do not store or use gasoline or other

flammable vapors or liquids or other

combustible materials in the vicinity of this or

any other appliance. To do so may result in an

explosion or fire.

— WHAT TO DO IF YOU SMELL GAS

● Do not try to light any appliance.

● Do not touch any electrical switch; do not

use any phone in your building.

● Immediately call your gas supplier from a

neighbor’s phone. Follow the gas supplier’s

instructions.

● If you cannot reach your gas supplier, call

the fire department.

● Do not return to your home until authorized

by the gas supplier or fire department.

— Improper installation, adjustment, alteration,

service or maintenance can cause property

damage, personal injury, or death. Refer to

this manual. Installation and service must be

performed by a qualified installer, service

agency or the gas supplier.

WARNING: If the information in these instructions is not followed exactly,

a fire or explosion may result causing property damage, personal injury or death.

The purpose of this manual is twofold: one, to provide the installer with the basic directions

and recommendations for the proper installation and adjustment of the water heater;

and two, for the owner–operator, to explain the features, operation, safety precautions,

maintenance and troubleshooting of the water heater. This manual also includes a parts list.

It is very important that all persons who are expected to install, operate or adjust this

water heater read the instructions carefully so they may understand how to perform

these operations. If you do not understand these instructions or any terms within it, seek

professional assistance.

Any questions regarding the operation, maintenance, service or warranty of this water

heater should be directed to the seller from whom it was purchased. If additional

information is required, refer to the section on “If you need service.”

Do not destroy this manual. Please read carefully and keep in a safe place for future

reference.

Recognize this symbol as an indication of Important Safety Information!

California Proposition 65 Warning: This product contains chemicals known to the

State of California to cause cancer, birth defects or other reproductive harm.

Residential 40, 50 Gallon

Use & Care Manual

With Installation Instructions for the Installer

Printed in USA

Water Heaters

W I T H E L E C T R O N I C C O N T R O L

Compliant with South Coast Air Quality Management District Rule 1121 10 ng/J NOx Emissions

Residential Gas - Low NOx Emissions

DO NOT RETURN this water heater to the store or place of purchase.

If you need technical or installation assistance, please call the Technical Support

Lines at 1-800-432-8373.

El manual en Español está disponible en www.rheem.com.

FVIR Certified

Warning: This water heater is not suitable

for use in manufactured (mobile) homes!

Care and Cleaning

Draining . . . . . . . . . . . . . . . . 31

Maintenance . . . . . . . . . . . . . 31

Vent System Inspection . . . . 32

Burner Inspection . . . . . . . . 32

Extended Shut-Down . . . . . .33

Safety Information

Safety Precautions . . . . . . . 3–6

LP Gas Models . . . . . . . . . . . 5

Installation Instructions

Location . . . . . . . . . . . . . . . . . 7

Water Supply Connections . . 9

Gas Supply . . . . . . . . . . . . . . 11

Venting . . . . . . . . . . . . . . .12-16

Wiring Diagram . . . . . . . . . . .17

Pipe Insulation . . . . . . . . . . . .18

Install User Display . . . . .19-20

User Display Operation . 21-23.

Heat Traps . . . . . . . . . . . . . . .24

Installation Checklist . . . . . . .25

Potable/Space Heating . . . . 26

Operating Instructions

Lighting Instructions . . . . . . 27

Water Temperature . . . . .28-30

Troubleshooting Tips

Before You Call

For Service . . . . . . . . . . . 34-36

Customer Service

Parts List . . . . . . . . . . . . . . . . 37

If You Need Service . . . . . . .40

FOR YOUR RECORDS

Write the model and serial numbers here:

You can find them on a label on the appliance.

Staple sales slip or cancelled check here.

Proof of the original purchase date is needed to obtain service under

the warranty.

Inside you will find many helpful hints on how to use and maintain

your water heater properly. A little preventive care on your part can

save you time and money over the life of your water heater.

You’ll find many answers to common problems in the

Troubleshooting Guide. If you review the chart of Troubleshooting

Tips first, you may not need to call for service.

READ THIS MANUAL

Your safety and the safety of others are very important. There

are many important safety messages in this manual and on your

appliance. Always read and obey all safety messages.

This is the safety alert symbol. Recognize this symbol

as an indication of Important Safety Information!

This symbol alerts you to potential hazards that can

kill or hurt you and others.

All safety messages will follow the safety alert symbol and

either the word “DANGER”, “WARNING”, “CAUTION” or

“NOTICE”.

These words mean:

DANGER

An imminently hazardous situation

that will result in death or serious

injury.

WARNING

A potentially hazardous situation that

could result in death or serious injury

and/or damage to property.

CAUTION

A potentially hazardous situation that

may result in minor or moderate

injury.

Notice:

Attention is called to observe a

specified procedure or maintain

a specific condition.

READ THE SAFETY INFORMATION

Be sure to read and understand the entire Use and Care Manual before attempting to install or operate this water

heater. It may save you time and money. Pay particular attention to the Safety Instructions. Failure to follow these

warnings could result in serious bodily injury or death. Should you have problems understanding the instructions in

this manual, or have any questions, STOP, and get help from a qualified service technician, or the local gas utility.

IMPORTANT SAFETY INFORMATION.

READ ALL INSTRUCTIONS BEFORE USING.

Failure to install the blower assembly and properly vent the water heater to the outdoors

as outlined in the Venting Section of the Installation Instructions in this manual can result

in unsafe operation of the water heater. To avoid the risk of fire, explosion, or asphyxiation

from carbon monoxide, never operate this water heater unless it is properly vented and

has an adequate air supply for proper operation. Be sure to inspect the vent system for

proper installation at initial start-up; and at least annually thereafter. Refer to the Care and

Cleaning section of this manual for more information regarding vent system inspection.

DANGER!

INSTALL THE BLOWER ASSEMBLY AND PROPERLY VENT

THE WATER HEATER

Gasoline, as well as other flammable materials and liquids (which include but are not

limited to adhesives, solvents, paint thinners etc.), and the vapors they produce are

extremely dangerous. DO NOT handle, use or store gasoline or other flammable or

combustible materials anywhere near or in the vicinity of a water heater or any other

appliance. Be sure to read and follow warning label pictured below and other labels on the

water heater, as well as the warnings printed in this manual. Failure to do so can result in

property damage, bodily injury or death.

WARNING!

FLAMMABLES

Flammable Vapors

FIRE AND EXPLOSION HAZARD

Can result in serious injury or death.

Do not store or use gasoline or other flammable vapors and liquids

in the vicinity of this or any other appliance. Storage of or use of gasoline

or other flammable vapors or liquids in the vicinity of this or any other

appliance can result in serious injury or death.

W A R N I N G

NOTICE: This water heater is equipped with a flammable vapor sensor that will automatically shut

down the water heater in the presence of gasoline vapors and some other flammable vapors. If the

flammable vapor sensor shuts down the water heater, contact a qualified service technician. Clear any

hazardous materials and ventilate the area around the water heater. Do not turn off the appliance

or adjust the ON/OFF switch in any way. Do not tamper with the flammable vapor sensor. Do not

submerse the flammable vapor sensor in water. Do not allow the flammable vapor sensor to come into

contact with any substances such as bleach or cleaners. See the “Gas Valve Error Code” Section of

this manual for a list of error codes.

Time/Temperature Relationship in Scalds

Water Temperature Time To Produce a Serious Burn

120°F More than 5 minutes

125°F 1

/2 to 2 minutes

130°F About 30 seconds

135°F About 10 seconds

140°F Less than 5 seconds

145°F Less than 3 seconds

150°F About 1

/2 seconds

155°F About 1 second

Table courtesy of Shriners Burn Institute

The chart shown above may be used as a guide in

determining the proper water temperature for your

home.

DANGER: Households with small children, disabled,

or elderly persons may require a 120°F or lower gas control

(thermostat) setting to prevent contact with “HOT” water.

Maximum water temperatures occur just after

the burner has shut off. To find water temperature

being delivered, turn on a hot water faucet and place

a thermometer in the water stream and read the

thermometer. (See page 24 and 25 for more details.)

The temperature of the water in the heater can be

regulated by rotating the dial on the front of the

gas control (thermostat). To comply with safety

regulations the gas control (thermostat) was set

at “HOT” position before the water heater was

shipped from the factory. The “HOT” dial position

corresponds to a water temperature of approximately

120°F. DANGER: Hotter water increases the

potential for Hot Water SCALDS. The illustration

below details the approximate water temperature

for each mark on the Gas Control (Thermostat)

Temperature Dial.

D A N G E R

HOT

Water temperature over 125°

can

cause severe burns

instantly or

death from scalds.

Children, disabled and elderly are

at highest risk of being scalded.

See instruction manual before

setting temperature at water

heater.

Feel water before bathing or

showering.

Temperature limiting valves are

available, see manual.

BURN

DANGER!

WATER TEMPERATURE SETTING

Safety and energy conservation are factors to be considered when selecting the water

temperature setting of a water heater’s gas control. Water temperatures above 125°F

can cause severe burns or death from scalding. Be sure to read and follow the warnings

outlined on the label pictured below. This label is also located on the water heater.

Notice: Mixing valves are available for reducing point

of use water temperature by mixing hot and cold water

in branch water lines. Contact a licensed plumber or the

local plumbing authority for further information.

IMPORTANT SAFETY INFORMATION.

READ ALL INSTRUCTIONS BEFORE USING.

Valve Set

Point

Estimated

Temperature

Burns on Adult Skin

LOW

90°F ------------------------

●

98°F ------------------------

●

105°F ------------------------

●

113°F ------------------------

HOT

120°F More than 5 minutes

130°F About 30 seconds

140°F Less than 5 seconds

150° About 1-1/2 seconds

VERY HOT

160°F About 1/2 second

DANGER: Hotter

water increases the

potential for Hot Water

SCALDS.

LP and Natural gas have an odorant added to aid in detecting a gas leak. Some people

may not physically be able to smell or recognize this odorant. If you are unsure or

unfamiliar with the smell of LP or natural gas, ask the gas supplier. Other conditions,

such as “odorant fade”, which causes the odorant to diminish in intensity, can also hide or

camouflage a gas leak.

DANGER!

LIQUEFIED PETROLEUM (LP PROPANE OR BUTANE)

AND NATURAL GAS MODELS

● Water heaters utilizing LP gas are

different from natural gas models. A

natural gas water heater will not function

safely on LP gas and vice versa.

● No attempt should ever be made to

convert the water heater from natural

gas to LP gas. To avoid possible

equipment damage, personal injury or

fire, do not connect the water heater to a

fuel type not in accordance with the unit

data plate. LP for LP units. Natural gas

for natural gas units. These units are not

certified for any other fuel type.

● LP appliances should not be installed

below grade (for example, in a basement)

if such installation is prohibited by

federal, state and/or local laws, rules,

regulations or customs.

● LP gas must be used with great caution.

It is heavier than air and will collect first

in lower areas making it hard to detect at

nose level.

● Before attempting to light the water

heater, make sure to look and smell for

gas leaks. Use a soapy solution to check

all gas fittings and connections. Bubbling

at a connection indicates a leak that must

be corrected. When smelling to detect a

gas leak, be sure to sniff near the floor

also.

● Gas detectors are recommended in LP

& natural gas applications and their

installation should be in accordance

with the detector manufacturer’s

recommendations and/or local laws,

rules, regulations or customs.

● It is recommended that more than one

method, such as soapy solution, gas

detectors, etc., be used to detect leaks in

gas applications.

DANGER: If a gas leak is present or

suspected:

● Donotattempt to find the cause

yourself.

● Donot try to light any appliance.

● Donot touch any electrical switch.

● Donot use any phone in your building.

● Leave the house immediately and make

sure your family and pets leave also.

● Leave the doors open for ventilation

and contact the gas supplier, a qualified

service agency or the fire department.

● Stay away from the house (or building)

until the service call has been made, the

leak is corrected and a qualified agency

has determined the area to be safe.

IMPORTANT SAFETY INFORMATION.

READ ALL INSTRUCTIONS BEFORE USING.

WARNING!

For your safety, the information in this manual must be followed to minimize the risk of

fire or explosion, electric shock, or to prevent property damage, personal injury, or loss of

life.

FOR INSTALLATIONS IN THE STATE OF CALIFORNIA

California Law requires that residential water heaters must be braced, anchored or

strapped to resist falling or horizontal displacement due to earthquake motions. For

residential water heaters up to 52-gallon capacity, a brochure with generic earthquake

bracing instructions can be obtained from: Office of the State Architect, 1102 Q Street,

Suite 5100, Sacramento, CA 95814 or you may call 916-445-8100 or ask a water heater

dealer.

However, applicable local codes shall govern installation. For residential water heaters

of a capacity greater than 52 gallons, consult the local building jurisdiction for acceptable

bracing procedures.

Have the installer show you the location of the gas shut-off valve and how to shut it off

if necessary. Turn off the manual shut-off valve if the water heater has been subjected to

overheating, fire, flood, physical damage or if the gas supply fails to shut off.

● Read this manual entirely before installing

or operating the water heater.

● Use this appliance only for its intended

purpose as described in this Use and Care

Manual.

● Be sure your appliance is properly installed

in accordance with local codes and the

provided installation instructions.

● Do not attempt to repair or replace any part

of your water heater unless it is specifically

recommended in this manual. All other

servicing should be referred to a qualified

technician.

SAFETY PRECAUTIONS

READ AND FOLLOW THIS SAFETY INFORMATION

CAREFULLY.

SAVE THESE INSTRUCTIONS

Combustion Air Inlet

Openings

Installing the water heater.

This water heater must be installed in accordance with these instructions, local codes, utility company

requirements, and/or in the absence of local codes, use the latest edition of the American National

Standard/National Fuel Gas Code. A copy can be purchased from either the American Gas Association,

400 N. Capitol Street NW, Washington, DC 20001 as ANSI standard Z223.1 or National Fire Protection

Association, 1 Batterymarch Park, Quincy, MA 02269 as booklet NFPA 54.

Location

The water heater should not be located

in an area where leakage from the tank

or connections will result in damage

to the area adjacent to the heater or to

lower floors of the structure.

When such areas cannot be avoided it is

recommended that a suitable catch pan,

adequately drained, must be installed

under the water heater.

The pan must not restrict air flow

to the combustion air inlet openings

(perforation openings) located around the

lower perimeter of the water heater.

Catch pan kits are available from the store

where the water heater was purchased, or

any water heater distributor.

Make certain the floor underneath the

water heater is strong enough to

sufficiently support the weight of the

water heater once it is filled with water.

A gas fired water heater or any other

appliance should not be installed

in a space where liquids which give off

flammable vapors are to be used or stored.

Such liquids include gasoline, LP gas

(butane or propane), paint or adhesives

and their thinners, solvents or removers.

When installed in a closet, DO NOT

block or obstruct any of the combustion

air inlet openings located around the

perimeter of the water heater. A

minimum of 1” is required between

these combustion air inlet openings and

any obstruction.

Because of natural air movement in a

room or other enclosed space, flammable

vapors can be carried some distance from

where liquids which give off flammable

vapors are to be used or stored. The open

flame of the water heater’s pilot or main

burner can ignite these vapors and create a

shut down condition of the water heater

which will not allow the water heater

to ignite until examined by a Qualified

Service Technician.

DO NOT obstruct or block the flammable

vapor sensor.

Rheem Water Heating FVIR certified

gas water heaters can be installed on a

residential garage floor without the use

of an 18-inch stand in accordance with

the National Fuel Gas Code, NFPA 54,

ANSI Z223.1 2006, paragraph 9.1.10

Installation in Residential Garages, unless

otherwise directed by State and Local

code requirements. The water heater must

be located so it is not subject to physical

damage, for example, by moving vehicles,

area flooding, etc

● The water heater should be installed

so as to minimize the length of plastic

vent pipe and the number of vent

connection fittings required. (Refer to

the “INSTALLATION” Section of this

manual.)

● Long hot water lines should be insulated

to conserve water and energy.

● The water heater and water lines should

be protected from exposure

to freezing temperatures.

● Do not install the water heater in

bathrooms, bedrooms, any occupied

rooms normally kept closed, or in

unprotected outdoor areas.

● Minimum clearance from combustible

construction:

If the clearances stated on the

Instruction/Warning Label, located on

the front of the heater differ, install the

water heater according to the clearances

stated on the label.

● If the water heater is installed in an

alcove or closet, the entire floor must

be covered by a wood or metal panel.

A minimum of 24” clearance from the

front and top should be available for

adequate inspection and servicing.

● The water heater may be installed on

combustible floors, but not directly on

carpeting. If the water heater must be

installed on carpeting, place a metal or

wood panel beneath the water heater,

extending beyond its full width and

depth at least 3” in all directions.

The auxiliary catch pan installation

MUST conform to local codes.

Diameter of

water heater

plus 2” min.

Max.

2”

WARNING: Combustible

construction refers to adjacent

walls and ceilings and should

not be confused with

combustible or flammable

products and materials.

Combustible and/or flammable

products and materials should

never be stored in the vicinity of

this or any gas appliance.

Location Front Sides Rear Top

Alcove

3”

(7.6 cm)

0”

(0 cm)

0”

(0 cm)

12”

(30.5 cm)

Closet

3”

(7.6 cm)

1”

(2.5 cm)

0”

(0 cm)

12”

(30.5 cm)

Rear

Sides

Front Open

Sides

Front Enclosed

Top View Closet

Top View Alcove

Rear

Installing the water heater.

Combustion and Ventilation Air

Ventilation (ambient) air temperature

must be 100°F or less. Proper operation

of the water heater requires air for

combustion and ventilation. Provisions

for combustion and ventilation air

must comply with referenced codes and

standards.

DO NOT block or obstruct any of the

combustion air inlet openings located

around the perimeter of the water

heater. A minimum of 1” is required

between these combustion air inlet

openings and any obstruction.

NOTICE: If the water heater is

installed in an unconfined space within a

building of conventional frame, masonry

or metal construction, infiltration

air is normally adequate for proper

combustion and ventilation. If the

water heater is installed in a confined

space, provisions for combustion and

ventilation air must be made.

DO NOT obstruct or block the Flammable

Vapor Sensor.

A confined space is one having a volume

of less than 50 cubic feet per 1000 Btuh

of the aggregate input of all appliances

within that space.

The air must be supplied through two

permanent openings of equal area. One

is to be located within 12” above the floor

and the other is to be located within 12”

from the ceiling.

The minimum net free area of each opening

must not be less than one square inch

per 1000 Btuh of the total input rating

of all the appliances in the enclosure

(but not less than 100 square inches), if

each opening communicates with other

unconfined areas inside the building.

Buildings of unusually tight construction

shall have the combustion and ventilation

air supplied from outdoors, or a freely

ventilated attic or crawl space.

If air is supplied from outdoors, directly or

through vertical ducts, there must be two

openings located as specified above and

each must have a minimum net free area

of not less than one square inch per 4000

Btuh of the total input rating of all the

appliances in the enclosure.

If horizontal ducts are used to

communicate with the outdoors, each

opening must have a minimum net free

area of not less than one square inch per

2000 Btuh of the total input rating of all

the appliances in the enclosure. If ducts

are used, the minimum dimensions of

rectangular air ducts shall not be less than

3”.

NOTICE: If the duct openings which

supply combustion and ventilation air

are to be covered with a protective

screen or grill, the net free area

(openings in the material) of the

covering material must be used in

determining the size of the openings.

Protective screening for the openings

MUST NOT be smaller than 1/4”mesh

to prevent clogging by lint or other

debris.

Corrosive Atmospheres

The air in beauty shops, dry cleaning

establishments, photo processing

labs, and storage areas for liquid and

powdered bleaches or swimming pool

chemicals often contain such halogenated

hydrocarbons.

An air supply containing halogenated

hydrocarbons may be safe to breathe,

but when it passes through a gas flame

corrosive elements are released that

will shorten the life of any gas burning

appliance.

Propellants from common spray cans

or gas leaks from A/C and refrigeration

equipment are highly corrosive after

passing through a flame.

The water heater warranty is voided when

failure of the heater is due to operation in

a corrosive atmosphere.

NOTICE: The water heater

should not be installed near

an air supply containing

halogenated hydrocarbons.

Inspect Shipment

Inspect the water heater for possible

damage. Check the markings on the rating

plate of the water heater to be certain the

type of gas supplied corresponds to the

water heater requirements.

NOTICE: Do not install the

water heater in attics where

the temperature may exceed

100°F. This water heater is

equipped with a temperature

sensing device that will

shut off the water heater

if the maximum allowable

vent pipe temperature is

exceeded.

Thermal Expansion

Determine if a check valve exists in the

inlet water line. Check with your local water

utility company. It may have been installed

in the cold water line as a separate back flow

preventer, or it may be part of a pressure

reducing valve, water meter or water softener.

A check valve located in the cold water inlet

line can cause what is referred to as a “closed

water system”. A cold water inlet line with no

check valve or back flow prevention device is

referred to as an “open” water system.

As water is heated, it expands in volume and

creates an increase in the pressure within

the water system. This action is referred to

as “thermal expansion”. In an “open” water

system, expanding water which exceeds the

capacity of the water heater flows back into

the city main where the pressure is easily

dissipated.

A “closed water system”, however, prevents

the expanding water from flowing back into

the main supply line, and the result of “thermal

expansion” can create a rapid and dangerous

pressure increase in the water heater and

system piping. This rapid pressure increase can

quickly reach the safety setting of the relief

valve, causing it to operate during each heating

cycle. Thermal expansion, and the resulting

rapid, and repeated expansion and contraction

of components in the water heater and piping

system can cause premature failure of the relief

valve, and possibly the heater itself. Replacing

the relief valve will not correct the problem!

The suggested method of controlling thermal

expansion is to install an expansion tank in

the cold water line between the water heater

and the check valve (see illustration below).

The expansion tank is designed with an air

cushion built in that compresses as the system

pressure increases, thereby relieving the over

pressure condition and eliminating the repeated

operation of the relief valve. Other methods

of controlling thermal expansion are also

available. Contact your installing contractor,

water supplier or plumbing inspector for

additional information regarding this subject.

Refer to the illustration below for suggested

typical installation. The installation of unions

or flexible copper connectors is recommended

on the hot and cold water connections so that

the water heater may be easily disconnected

for servicing if necessary. The HOT and COLD

water connections are clearly marked and are

3/4” NPT on all models. Install a shut-off valve

in the cold water line near the water heater.

Water Supply Connections

IMPORTANT: Do not apply

heat to the HOT or COLD

water connections. If sweat

connections are used, sweat

tubing to adapter before

fitting adapter to the cold

water connections on heater.

Any heat applied to the cold

water supply fittings will

permanently damage the

dip tube and heat traps.

NOTICE: The National

Fuel Gas Code (NFGC)

mandates a manual gas shut-

off valve: See (NFGC) for

complete instructions. Local

codes or plumbing authority

requirements may vary from

the instructions or diagrams

provided and take precedent

over these instructions.

Vacuum Relief Valve

(Not Supplied)

If required, install per local codes

and valve manufacturer’s

instructions.

Heat trap

6” minimum

Heat trap

6” minimum

Union

To gas supply

Sediment trap

Cap

Ground joint union

Drain Pan Pipe

to suitable drain.

Drain

valve

Relief valve discharge

line to suitable open

drain.

To cold water

supply

6” Air gap

Blower assembly

1/4” per foot maximum slope up or

down for horizontal venting.

Auxiliary catch pan

Union

Anode

Vent connector

Thermostatic gas valve

Jacket door

Manual gas shut-off

Temperature and

pressure relief valve

Shut-off valve

Shut-off

valve

Thermal expansion

tank (if required)

Combustion Air

Inlet Openings

Hot water outlet to

fixtures

Water Heater Jacket

Flammable Vapor Sensor

Typical Installation

Installing the water heater.

A new combination temperature and pressure relief valve, complying with the Standard for Relief Valves

and Automatic Gas Shut-Off Devices for Hot Water Supply Systems, ANSI Z21.22, is supplied and must

remain in the opening provided and marked for the purpose on the water heater. No valve of any type

should be installed between the relief valve and the tank. Local codes shall govern the installation of

relief valves.

Relief Valve

The pressure rating of the relief valve

must not exceed 150 PSI, the maximum

working pressure of the water heater as

marked on the rating plate.

The Btuh rating of the relief valve must

equal or exceed the Btuh input of the

water heater as marked on its rating plate.

Position the outlet of the relief valve

above a suitable open drain to eliminate

potential water damage. Piping used

should be of a type approved for hot water

distribution.

The discharge line must be no smaller

than the outlet of the valve and must

pitch downward from the valve to allow

complete drainage (by gravity) of the

relief valve and discharge line.

The end of the discharge line should not

be threaded or concealed and should be

protected from freezing. No valve of

any type, restriction, or reducer coupling

should be installed in the discharge line.

To Fill the Water Heater

Make certain that the drain valve is

closed, then open the shut-off valve in the

cold water supply line.

Open each hot water faucet slowly to

allow the air to vent from the water

heater and piping.

A steady flow of water from the hot water

faucet(s) indicates a full water heater.

Do not allow the flammable vapor sensor

to become submerged in water.

WARNING: The tank

must be full of water before

heater is turned on. The

water heater warranty does

not cover damage or failure

resulting from operation

with an empty or partially

empty tank.

Condensation

Condensation can form on the tank

when it is first filled with water.

Condensation might also occur with a

heavy water draw and very cold inlet

water temperatures.

Drops of water falling on the burner can

produce a sizzling or pinging sound.

This condition is not unusual, and will

disappear after the water becomes heated.

If, however, the condensation continues,

examine the piping and fittings for

possible leaks.

NOTICE: Additional information on this

subject may be found at www.rheem.com,

under Rheem Water Heating, "Customer

Service", scroll down to the Technical

Bulletins and to Bulletins 1400 Series

Section and choose Bulletin #1402..

WARNING: Do not attempt to convert this water heater for use with a different type of gas other than the type

shown on the rating plate. Such conversion could result in hazardous operating conditions.

Leak Testing

The water heater and its gas connections

must be leak tested at normal operating

pressures before it is placed in operation.

Turn on the manual gas shut-off

valve near the water heater.

Use a soapy water solution to test for

leaks at all connections and fittings.

Bubbles indicate a gas leak that must

be corrected.

The factory connections to the gas

control (thermostat) should also be leak

tested after the water heater is placed in

operation.

Pressure Testing the Gas Supply System

The water heater and its manual gas

shut-off valve must be disconnected from

the gas supply piping system during any

pressure testing of that system at

pressures in excess of 3/8 psi (10.5” w.c.)

for natural gas.

The water heater must be isolated from

the gas piping system by closing the

manual gas shut-off valve during any

pressure testing of the gas supply piping

at pressures equal to or less than

3/8 psi (10.5” w.c.) for natural gas

Gas Supply

The branch gas supply line to the water

heater should be clean 1/2” black steel

pipe or other approved gas piping

material.

A ground joint union or ANSI design

certified semi-rigid or flexible gas

appliance connector should be installed

in the gas line close to the water heater.

The National Fuel Gas Code (NFGC)

mandates a manual gas shut-off valve: See

(NFGC) for complete instructions.

If flexible connectors are used, the

maximum length shall not exceed 36”

and must meet the requirements in ANSI

Z21.24-Connectors for Gas Appliances.

If lever type gas shut-offs are used,

they shall be T-Handle type.

Compound used on the threaded joints of

the gas piping must be of the type resistant

to the action of LP gas. Use compound

sparingly on male threads only.

Where a sediment trap is not incorporated

as part of the appliance, a sediment trap

shall be installed downstream of the

equipment shutoff valve as close to the

inlet of the appliance as practical at the

time of the appliance installation. The

sediment trap shall be either a tee fitting

with a capped nipple in the bottom outlet

or other device recognized as an effective

sediment trap.

Do not use excessive force (over 31.5 ft

lbs.) in tightening the pipe joint at the gas

control (thermostat) inlet, particularly if

teflon pipe compound is used, as the valve

body may be damaged.

The inlet gas pressure to the water heater

must not exceed 10.5” w.c. for natural

gas. For purposes of input adjustment, the

minimum inlet gas pressure (with main

burner on) is shown on the water heater

rating plate. If high or low gas pressures

are present, contact your gas supplier for

correction.

WARNING: Never use

an open flame to test for

gas leaks, as property

damage, personal injury, or

death could result.

High Altitude

Input rating of this water heater is

based on sea level operation. At higher

elevations the actual input rate may be

lower than the value listed on the rating

label due to the derating of natural gas.

This water heater can be installed at

elevation up to 2,000 feet without any

change or modification.

Installations above 2,000 feet are not

authorized.

Contact the local gas supplier for more

information.

WARNING: Failure to

install a water heater

suitable for the altitude at

the location it is intended to

serve, can result in improper

operation of the appliance

resulting in property

damage and/or producing

carbon monoxide gas, which

could result in personal

injury, or death.

Installing the water heater.

The water heater must be installed with the factory supplied blower assembly in place.

Venting

The water heater must be vented to the

outdoors as described in these instructions.

DO NOT connect this water heater to

an existing vent or chimney - it must

be vented separately from all other

appliances.

NOTICE: This unit can be vented using

only the following recommended pipe

material. Use only 2- or 3-inch diameter

pipe.

PVC (Schedule 40, ASTM D1785)

CPVC (Schedule 40, ASTM F441)

ABS (Schedule 40, ASTM D2661)

ABS (Schedule 40 DWV, Cellular Core,

ASTM F628)

The fittings, other than the TERMINATION,

should be equivalent to the following:

PVC (Schedule 40 DWV, ASTM D2665)

CPVC (Schedule 40, ASTM F438)

ABS (Schedule 40 DWV, ASTM D2661)

The unit may be vented horizontally

through a wall or vertically through the

roof.

Vent pipe runs must be adequately

supported along both vertical and

horizontal lengths.

Maximum unsupported length is

recommended to be no more than 6 feet.

It is imperative that the first hanger

be located on the horizontal length

immediately adjacent to the first

90-degree elbow from the vertical rise of

vent pipe connected to the water heater.

The support method used should isolate

the vent pipe from floor joists or other

structural members to help prevent the

transmission of noise and vibration.

Do not support, pin or otherwise secure

the venting system in a way that restricts

the normal thermal expansion and

contraction of the chosen venting material.

If the water heater is being installed as a

replacement for an existing power vented

water heater, a thorough inspection of

the existing venting system must be

performed prior to any installation work.

Verify that the correct materials as

detailed above have been used, and

that the minimum or maximum vent

length and terminal locations as

detailed in this manual have been

met.

Carefully inspect the entire venting

system for any signs of cracks or

fractures, particularly at the joints

between elbows or other fittings and

the straight length of vent pipe.

Check the system for signs of sagging

or other stresses in the joints as a

result of misalignment of any

components in the system.

If any of these conditions are found,

they must be corrected in accordance

with the venting instructions in this

manual before completing the

installation and putting the water

heater into service.

DANGER: Failure to

install the blower assembly

and properly vent the water

heater to the outdoors as

outlined in the Venting

section of this manual will

result in unsafe operation of

the water heater causing

bodily injury, explosion,

fire or death.

To avoid the risk of fire,

explosion, or asphyxiation

from carbon monoxide,

NEVER operate the water

heater unless it is properly

vented and has adequate air

supply for proper operation

as outlined in the Venting

section of this manual.

The vent pipe must overlap

a minimum of ½” on each

connection. It is important

that the vent pipe engages

fully into any pipe fitting

and be kept in that position

until the adhesive has fully

cured. DO NOT drill or

punch holes in the plastic

pipe or fittings.

NOTICE: This unit is

equipped with a Flammable

Vapor Sensor. Do not

apply power until enough

time has passed to allow the

vapors from the primer and

cement to dissipate.

Blower Assembly Installation

(if not factory installed)

Connect blower assembly with the electrical connector.

Attach Blower Assembly to top pan using the six (6)

screws provided (See diagram to the left). Install rubber

coupling (supplied in the box with water heater) on

blower housing and secure it.

NOTICE: The Blower Assembly is model specific and

only the blower assembly supplied should be used on

this water heater.

Additional installation infor-

mation for The Commonwealth

of Massachusetts is located on

the back page of this manual.

Flue

Baffle

Rubber

Coupling

Blower

Assembly

Maximum and Minimum Vent Lengths for Residential

40 & 50 Gallon Power Vents

NOTICE: The mixing of 2" and

3" vent pipe is not recommended.

If 3" pipe is used, a 2" to 3"

reducer fitting is recommended at

the rubber coupling.

This water heater is supplied with

a two-inch Schedule 40 PVC 45°

vent terminal. When venting with

3" pipe, a Schedule 40 PVC 45° vent

terminal must be used. Screens for

both 2" and 3" vent terminals have

been included.

Maximum Venting information for 2” Vents*

* For the 2” vent, one 90° elbow is approximately equal to 6 feet of vent pipe.

One 45° elbow is approximately equal to 3 feet of vent pipe.

Minimum vent length for 2”vent pipe is one (1) foot of vertical pipe, one (1)

90°elbow, and two (2) feet of horizontal pipe.

Number of 90° elbows

with Vent

Number of

45° Elbows

Maximum Vent Pipe

Length in Feet (ft)

0-Maximum Altitude: See chart on upper left.

One (1) None 95

One (1) One (1) 92.5

Two (2) None 90

Two (2) One (1) 87.5

Three (3) None 85

Three (3) One (1) 82.5

Four (4) None 80

Four (4) One (1) 77.5

Five (5) None 75

Maximum Venting information for 3” Vents**

** For the 3” vent, one 90° elbow is approximately equal to 5 feet of vent

pipe. One 45° elbow is approximately equal to 2.5 feet of vent pipe.

Minimum vent length for 3” vent pipe is one (1) foot of vertical pipe, one (1)

90°elbow, and two (2) feet of horizontal pipe.

Models Maximum

Altitude

for

2” & 3”

Vents

42VP40FN

42VP50FN

2,000’

Number

of 90°

elbows

with Vent

Number

of 45°

Elbows

Maximum Vent Pipe

Length in Feet (ft)

0’ - 2,000’

One (1) None 44

One (1) One (1) 41

Two (2) None 38

Two (2) One (1) 35

Three (3) None 32

Installing the water heater.

Additional Considerations

Do Not install vent terminal under any patio or deck.

To help prevent moisture from freezing on walls and under

eaves, do not locate vent terminal on the side of a build ing

with prevailing winter winds.

When terminating the vent pipe through brick or masonry

surfaces, a rust-resistant sheet metal backing plate

behind the vent termination is recommended.

(See illustration.)

Do Not locate vent terminal too close to shrubbery, as flue

gasses may damage them.

Caulk all cracks, seams and joints within six (6) feet of vent

terminal.

All painted surfaces should be primed to lessen the chance of

physical damage. Painted surfaces will require maintenance.

Insulate vent pipe exposed to cold conditions (attics, crawl

spaces, etc.) with inflammable material to help prevent

moisture from accumulating in vent pipe.

Do Not extend exposed vent pipe outside of building.

If soffit vent is too

close, block off and

install new vent at

another location

Inside

corner

Caulk

6' (1.83 m)

caulk

zone or to edge of

window etc., starting

within 6'

Rising moisture will

collect under eaves

6' caulk zone

2 ft. sq. sheet metal plate on

brick or masonary surface is recomended.

WARNING: Moisture in the flue gas will condense as it

leaves the vent terminal. In cold weather this condensate can

freeze on the exterior wall, under the eaves and on

surrounding objects. Some discoloration to the exterior of

the building is to be expected. However, improper location

or installation can result in severe damage to the structure

or exterior finish of the building

Horizontal Vent Terminal Location

The location of the vent terminal depends on the following

minimum clearances and considerations (see illustration):

Vent Terminal must be at least twelve (12) inches above

grade level and above normal

snow levels.

Vent Terminal must be at least four (4) feet below, or four

(4) feet horizontally from any door, operable window, soffit,

under eave vent or gravity air inlet to the building or other

appliances, or from gas or electric meters. Do not locate

vent above walkways, doors, windows, air inlets, gas or

electric meters or other equipment.

Vent Terminal must be at least three (3) feet above any

forced air inlet located within ten (10) feet. Any fresh or

make-up air inlet such as for a dryer or furnace area is

considered to be a forced air inlet.

Vent Terminal must be at least eighteen (18) inches from an

inside corner formed by two exterior walls.

Soffit vents

18"

Electric

meter

Inside

corner

3' above

if within 10'

Fresh

air

intake

12" (Above grade/snow level)

window or vent

NOTICE: All pipe, fittings, solvent cement, primers and procedures must conform to American

National Standards Institute and American Society for Testing and Materials (ANSI/ASTM) standards.

2 ft. sq. sheet metal plate on brick or

masonry surface is recommended.

NOTICE: All pipe, fittings, solvent cement, primers and procedures must conform to American

National Standards Institute and American Society for Testing and Materials (ANSI/ASTM) standards.

Vertical Vent Installation

Once the vent terminal location has been

determined, make a hole through the roof

and interior ceiling to accommodate the

vent pipe.

Complete the vent pipe installation to the

water heater's vent connector fitting on the

blower outlet.

Support vertical or horizontal lengths as

previously mentioned.

Install adequate flashing where the vent

pipe passes through the roof.

Determine the vent terminal height and cut

vent pipe accordingly. Refer to the above

section for proper vent terminal height.

Connect vent elbow onto vertical pipe

through roof.

Connect short piece of vent pipe

(approximately 3" long) to elbow, then

insert 1/2" mesh metal screen into terminal

elbow and join it to the short piece of vent

pipe.

Horizontal Vent Installation

Once the vent terminal location has been determined, make a

hole through the exterior wall to accommodate the vent pipe.

Vent pipe must exit exterior wall horizontally only.

Insert a small length of vent pipe through the wall and connect

the coupling as shown to the left.

Place the 1/2" mesh metal screen inside the terminal fitting

and connect it as shown to the vent pipe on the exterior of the

building.

Complete the rest of the vent pipe installation to the water

heater's vent connector fitting on the blower outlet.

If necessary support horizontal run as previously mentioned.

2' x 2' Sheet

Metal Shieldon

Brick or Masonry

Walls

Outside of

Building Wall

From

Water Heater

Vent Pipe

Pipe Coupling

Vent Terminal

with

" Mesh

Protective Screen

Inside

Vertical Vent Termination Location

The location of the vent terminal depends on the following

minimum clearances and considerations (see illustration):

Minimum twelve (12) inches above roof.

Minimum twelve (12) inches above anticipated snow level.

Maximum twenty-four (24) inches above roof level without

additional support for vent.

Four (4) feet from any gable, dormer or other roof structure

with building interior access (i.e., vent, window, etc.).

Ten (10) feet from any forced air inlet to the building. Any

fresh or make-up air inlet such as a dryer or furnace area is

considered to be a forced air inlet.

Short Piece of Vent Pipe

Min. 12" Above Roof

Min. 12" Above

Anticipated Snow

Level.

Max. 24" Above Roof

(Without Additional

Support)

Insert 1/2" Mesh Protective

Screen Inside Terminal Elbow

Vent Pipe

Through Roof

Elbow

Vent Terminal

Install the vent restrictor at the minimum

vent length only. The vent restrictor

should NOT be installed for any vent

lengths greater than those on page 13.

Minimum Vent Restrictor

Vent Pipe

Mesh

Vent Restrictor

Vent Terminal

Installing the water heater.

All joints in the vent piping must be

properly sealed and the following

materials are recommended:

PVC materials should use ASTM D2564

grade cement.

CPVC materials should use ASTM F493

grade cement.

ABS materials should use ASTM D2235

grade cement.

Cleaner-Primer and Medium Body Solvent

Cement:

Cut pipe end square, remove jagged

edges and burrs. Chamfer end of pipe,

then clean fitting socket and pipe joint

area of all dirt, grease or moisture.

After checking pipe and socket for

proper fit, wipe socket and pipe with

cleaner-primer. Apply a liberal coat of

primer to inside surface of socket and

outside of pipe. Do not allow primer to

dry before applying cement.

Apply a thin coat of cement evenly in

the socket. Quickly apply a heavy coat

of cement to the pipe end and insert

pipe into fitting with a slight twisting

motion until it bottoms out.

NOTICE: Cement must be fluid; if not,

recoat.

Hold the pipe fitting for 30 seconds to

prevent the tapered socket from pushing

the pipe out of the fitting.

Wipe all excess cement from the joint

with a rag. Allow 15 minutes before

handling. Cure time will vary according

to fit, temperature and humidity.

NOTICE: Stir the solvent cement

frequently while using. Use a natural

bristle brush or the dauber supplied

with the can. The proper brush size is

one inch.

NOTICE: This unit is equipped with a

Flammable Vapor Sensor. Do not apply

power until enough time has passed to

allow the vapors from the primer and

cement to dissipate.

Cementing Joints

WARNING: DANGER

OF FIRE OR BODILY

INJURY - Solvent cements

and primers are highly

flammable. Provide

adequate ventilation and do

not assemble near heat

source or open flame. Do not

smoke. Avoid skin or eye

contact. Observe all cautions

and warnings on material

containers.

CAUTION:

For proper installation:

DO NOT use solvent cement

that has become curdled,

lumpy or thickened.

DO NOT thin solvent

cement. Observe shelf

precautions printed on the

containers.

For applications below 32°F

use only low temperature

type solvent cement.

Appropriate solvent and

cleaner must be used for the

type of vent pipe used (PVC,

CPVC or ABS).

NOTICE: All pipe, fittings, solvent cement, primers and procedures must conform to American

National Standards Institute and American Society for Testing and Materials (ANSI/ASTM) standards.

Wiring

If local codes permit, the water heater may

be connected to electric service with the

power cord provided (DO NOT use an

extension cord). A grounded receptacle is

required.

If local codes do not permit the use of

cord connections, a 120 V, 50/60 Hz

power supply, with suitable disconnecting

means, must be connected to the black and

white leads in the heater control enclosure.

A knock-out hole is provided to permit use

of conduit or metal-clad cable connectors.

The maximum current draw is

approximately 5.0 amps.

The water heater must be electrically

grounded in accordance with local

codes, or, in the absence of local codes,

in accordance with latest edition of the

National Electric Code ANSI/NFPA No.

70. Refer to the figures below for water

heater internal wiring.

NOTE: It is not recommended that this

unit be installed on a GFCI circuit.

CAUTION! Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and

dangerous operation. VERIFY PROPER OPERATION AFTER SERVICING!

PRESSURE

SWITCH

TEMPERATURE

SWITCH

SPARK

GND

120

PILOT

ELECTRODE

ASSY

TS1

TS2

MOT

SCHEMATIC

CONNECTION DIAGRAM

WV 4460E CONTROL

120 VAC

INDUCER

AX5008

3 x 2 CONNECTOR

BK = BLACK

BL = BLUE

G = GREEN

R = RED

W = WHITE

Y = YELLOW

TS2

TS1

120 NEUT

GROUND

120 VAC

For increased energy efficiency, some

water heaters have been supplied with

two 24” sections of pipe insulation.

Please install the insulation, according

to the illustrations above, that best meets

your requirements.

Typical vertical piping arrangement

Typical horizontal piping arrangement

Hot and Cold Pipe Insulation Installation

Insulation Blankets

Insulation blankets, available to the

general public, for external use on gas

water heaters are not necessary. The

purpose of an insulation blanket is to

reduce the standby heat loss encountered

with storage tank heaters. This water

heater meets or exceeds the National

Appliance Energy Conservation Act

standards with respect to insulation and

standby loss requirements making an

insulation blanket unnecessary.

The manufacturer’s warranty does not

cover any damage or defect caused by

installation, attachment or use of

any type of energy saving or other

unapproved devices (other than those

authorized by the manufacturer) into, onto

or in conjunction with the water heater.

The use of unauthorized energy saving

devices may shorten the life of the water

heater and may endanger life and property.

The manufacturer disclaims any

responsibility for such loss or injury

resulting from the use of such

unauthorized devices.

CAUTION: If local codes require the

application of an external insulation

blanket to this water heater, pay careful

attention to the following so as not to

restrict the proper function and

operation of the water heater:

● Do not cover the operating or warning

labels attached to the water heater or

attempt to relocate them on the exterior

of insulation blanket.

 Do not apply insulation to the top of the

water heater. This will interfere with the

safe operation of the blower assembly.

 Do not cover the burner access door,

jacket door, gas control (thermostat)/gas

valve or pressure and temperature relief

valve.

 Do not apply insulation to the bottom

of the water heater or the area where

the combustion air inlet openings and

Flammable Vapor Sensor are located.

This area must be unobstructed so as

not to restrict combustion air flow to

the burner or operation of the sensor.

 Inspect the insulation blanket frequently

making certain it has not sagged

and it is not restricting the air flow

to the combustion air inlet openings

(perforation holes) or the Flammable

Vapor sensor located around the lower

perimeter of the water heater jacket.

This could result in an unsafe operating

condition.

WARNING: If local

codes require external

application of insulation

blanket kits the

manufacturer’s instructions

included with the kit must

be carefully followed.

Installing the water heater.

Dilution Air Holes

Installing the water heater continued.....

❑ DO check inlet gas pressure to ensure that

it is within the range specified on the rating

plate.

❑ DO provide adequate air for combustion

and ventilation as discussed in the Use and

Care Manual and the National Fuel Gas

Code.

❑ DO maintain proper clearances to

combustibles as specified on the rating plate.

❑ DO allow enough time for joint cement

vapors to dissipate BEFORE applying

power to the water heater.

❑ DO ensure that the venting system

complies with the guidelines found in the

Use and Care Manual and National Fuel Gas

Code.

❑ DO contact a qualified service technician

if the main burner will not stay lit. The burner

chamber is designed to be sealed utilizing a

gasket and tamper resistant screws.

DON’T

❑ DON’T block or restrict Combustion

Air Inlet Openings or the Flammable Vapor

Sensor located around the lower portion of

the water heater jacket.

❑ DON’T block or restrict the Blower

Assembly Dilution Air holes (see diagram to

the left).

❑ DON’T remove the Burner Access Door

unless absolutely necessary. This should only

be done by a qualified service technician. A

new burner access door gasket must be

installed on any burner access door that has

been removed.

❑ DON’T install this water heater where

standing water may occur. The base of the

water heater is meant to be mounted on a dry

surface.

❑ DON’T allow cleaners, solvents, or other

materials to come into contact with the

Flammable Vapor Sensor.

❑ DON’T operate the water heater if the

sight glass or burner access door grommet is

damaged or broken (see to the left).

During Installation of this water heater...........

Heat Trap

For increased energy efficiency, some

water heaters have been supplied with

factory installed 3/4” NPT heat traps in

the hot outlet line and cold water inlet

line.

These heat traps may require a minimum

of one (1) 90° 3/4” NPT elbow and may

require an additional 90° 3/4” NPT elbow

or a 3/4” coupling depending on your

installation needs. See Illustration of

nipples and heat traps on page 33.

Location of Dilution Air Holes

Sight Glass

Flammable

Vapor Sensor

Burner Access

Door Grommet

Installation Checklist

A. Water Heater Location

B. Water Supply

C. Gas Supply

D. Relief Valve

E. Venting

❑ Close to area of vent.

❑ Indoors and protected from freezing

temperatures.

❑ Proper clearance from combustible surfaces

observed and water heater not installed on

carpeted floor.

❑ Sufficient fresh air supply for proper

operation of water heater.

❑ Air supply free of corrosive elements and

flammable vapors.

❑ Provisions made to protect area from water

damage.

❑ Sufficient room to service heater.

❑ Combustible materials, such as clothing,

cleaning materials, rags, etc. clear of the

base of the heater.

❑ Clearances of 1” from combustion air

inlet openings observed

❑ Flammable vapor sensor is not blocked.

❑ Water heater completely filled with water.

❑ Air purged from water heater and piping.

❑ Water connections tight and free of leaks.

❑ Gas line equipped with shut-off valve, union

and sediment trap.

❑ Approved pipe joint compound used.

❑ Soap and water solution used to check all

connections and fittings for possible gas

leak.

❑ Gas Company inspected installation (if

required).

❑ Temperature and Pressure Relief Valve

properly installed and discharge line run to

open drain.

❑ Discharge line protected from freezing.

❑ Heater vented separately from all other

appliances.

❑ Flue baffle properly hung in top of heater’s

flue.

❑ Blower assembly properly installed.

❑ Proper materials and techniques used in vent

assembly.

❑ Vent pipe properly secured to blower housing.

❑ Vent pipe supported at required intervals.

❑ Appropriate minimum clearances observed.

❑ Precautions taken to prevent moisture damage

around vent termination.

❑ Vapors from vent pipe cement and primer

have dissipated prior to applying electrical

power.

F. Wiring

❑ Correct power supply (120 V).

❑ Electrical connections tight.

❑ Heater properly grounded and proper polarity

observed.

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Rheem PowerVent Commercial Gas Water Heater User manual

Brand: Rheem

Model: PowerVent Commercial Gas Water Heater

Category: Water heaters & boilers

Type: User manual

This manual is also suitable for

Professional Classic Series: Ultra Low NOx Power Vent

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Rheem PowerVent Commercial Gas Water Heater User manual

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